This ruin crowns a low hill about 3 miles south of Dolores (fig. 3). The form of the mound is semicircular with a depression in the middle around which can be traced radiating partitions suggesting compartments. Its outer wall on the south side, as in so many other examples of this type, has fallen, and the indications are that here the wall was straight, or like that on the south side of Horseshoe Ruin. The author’s attention was first called to this ruin by Mr. Gordon Parker, supervisor of the Montezuma Forest Reserve, it having been discovered by Mr. J. W. Emerson, one of his rangers. The circular or semicircular form (fig. 4) of the mound indicates at once that it does not belong to the same type as Far View House; the central depression is surrounded by a series of compartments separated by radiating walls like the circular ruins in the pueblo region to the south. Mr. Emerson’s report, which follows, points out the main features of this remarkable ruin.[31] [31] The letter referring to the circular ruin near Dolores was prepared by Mr. Emerson, the discoverer of this ruin, and was transmitted to the Smithsonian Institution as part of a phase of cooperative work with the Forest Service, by Mr. Gordon Parker, superintendent of the Montezuma Forest Reserve. [Illustration: FIG. 3.—Metes and bounds of Emerson Ruin. (After Emerson.)] DOLORES, COLORADO, _July 7, 1917_. In August, 1916, I visited Mesa Verde National Park. While there Doctor Fewkes inquired in regard to ruins in the vicinity of the Big Bend of the Dolores River. He informed me that the log of two old Spanish explorers of 1775 described a ruin near the bend of the Dolores River as of great value. Later, during October, 1916, I visited a number of ruins in this vicinity, including the one which (for the want of a better name) I have mapped and named Sun Dial Palace. Later, last fall, I again visited these ruins with Mr. R. W. Williamson, of Dolores, Colorado. On July 5, 1917, I again visited these ruins, which I have designated as Reservoir Group and Sun Dial Palace.[32] For location and status of land on which they lie see map of sec. 17, T. 37 N., R. 15 W., N. M. P. M. (fig. 3).